Whenever one of our server's admins tries to access our machine running Mac OS X Server 10.5 via SSH, I get the following error exactly every 10 seconds in the security log:
sshd: /etc/sshd_config line 70: Unsupported option KerberosGetAFSToken
sshd: error: PAM: Authentication failure for (username) from 220.127.116.11
sshd: Failed keyboard-interactive/pam for (username) from 18.104.22.168
The user is able to log in and work as normal, but this error is dominating the log file. At first we discovered he had a left-over public ssh key on his system, but even after deleting that the error persists. The error keeps appearing every 10 seconds, even when the user is no longer logged into the server!
Has anyone seen this issue before? How can these errors be generated from the same IP even when that machine does not have an open connection to the server? Where else should I look?
Thanks very much for your help!